Burglar-alarm.



No, 726.149. 7 PATENTBD APR.21,1-90s'.

v R. M. DUNKIN.

BURGLAR ALARM.

' APPLICATION FILED JULY 8, 1902.

N0 MODEL.

. z fig 4 5 8'10 H ll m 9 r 27 29 J a 2 UNITED STATES PATENT OFFICE.

REUBIN M. DUNKIN, OF LOS ANGELES, CALIFORNIA.

B'U R'GLAR -A LA RM.

SPECIFICATION formingpart of Letters Patent N 0. 726,149, dated April 21, 1903.

Application filed July 8, 1902.

To all whom it may co'ncern- Be it known that I, REUBIN M. DUNKIN, a citizen of the United States, residing at .Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Burglar-Alarms, of

which the following is a specification.

My invention relates to improvementsin burglar-alarms, (subclass of ringing,) wherein a bell is associated with mechanism adapted to produce or make rapid contact upon the bell, and thus give an alarm; and the object is to simplify and improvejhe existingart by providing an alarm of the kind named which is simple in construction, efiicient in effect, and certain in attainment of the purposes intended.

I accomplish the objects of my improve"- ments by means of the constructions and arrangement of the mechanism illustrated in the annexed drawings, forming a part of this specification, and wherein- Figure 1 is a perspective view of the improved device as attached to .a"do0r.- Fig. 2

is a vertical section through the bell, back. plate, and housing and showingthetactu'ating mechanism in side elevation. Fig. 3 is a detail front elev'ationofthe device with the. bell removed and'showing'the trigger-spring and clamping-'leverin the. positions they occupy when the alarm is fixed' in place. Fig. 4

is a detail verticalsection'and side elevation of the holding or fastening spring. Fig; 51s a detail perspective View of the fastening spring.

Similar designations throughout the several 3 elements or illustrations refer to the same parts.

Referring to the drawings, 1 designates line indicating the meeting edges of-the doorgj stile and door, the device being shown'as se cured to the door.

2 designates the knob of the door.

I 7 It may. be stated that the-device may be'u'ti'lized for; attachment "to a window by inserting the spring-holder between the meeting-rails of or other crevice suitable to Serial No. 114,815. (No model.)

; edges and conceal the mechanism. At the upper part of the circular plate 3, integral therewith, is a rectangular plate 4, of such length and width as may adapt it as a fastening or holding means when the device is in position on a door or window-sash. Longitudinally in the plate 4 is a slot 5, extending such distance as to permit the plate to be accommodated to doors having the keyholes of the lock inadeat different distances from the closing edge.

6designates the fasteningorholdingspring, which is a flat piece of spring metal doubled together, with one arm or leaf free to move away from its companion. To the other arm, at its inner end, is secured a stem 7, which is slidingly projected through the slot 5 and through a washer 8 and is pivotally secured to a cam-head 9 of a lever 10. On the fastening piece or stem 7 is arranged a bowspring 11, having its ends slidingly disposed in the slot 5 and its bow pressing outward against the end of the spring which carries the stem. T

It will now be perceived that the lever, the washer, and the springs may all be simultaneously and in unison moved along the slotfin either direction and that when the desired position is reached then the, lever may be turned down, thereby clamping the movable parts'to the plate. Centrally in the ci-rc-ularnpla te 3 is journale'd one end-of the-spindleor arbor 12, Whichprojeots throught'h'e main plate of the housing and at its'ou'tei' en-dth'rough the bell, which is held by it; -::At-a suitable point on the spindle is .loosely mounted a gear-wheel 13, having. fastened to its face, as at 14, the outer end of'a driving-spring 15, the other end of the spring being fixed to the spindle in any well-known manner. Fixed to the spindle 12 is a ratchet-pinion 16, with which a spring-pawl 17 engages to hold the main gles to the plate? are two laterally-extending arms 19 20. In the end of the arm 19 is journaled one end of an arbor 21, the other end sprihgfrom action While being Wound up in ICO to lie flat on the face of the plate, with the lug free from the pins. On the trigger-spring is slidingly arranged a trigger 28, consisting of a flat rod clipped to the trigger-spring and formed with an inwardly-extending arm 29, the free end of which is adapted to engage against the surface of the door-frame stile when the device is in operative position on the door, in which position the trigger-spring is pressed outward to bring the lug thereon in the path of the pins in the escape-wheel and lock the wheel against rotation, together with the associated mechanism. It will now be perceived that when the device is secured against the door the trigger-spring will be moved outward with the lug into engagement with one of the pins of the escape-wheel and the end of the arm on the end of the trigger holding the spring in such engagement. Now should the door be opened the triggerspring will be free to resume its position flat on the plate and out of the way of the pins in the escape-wheel, thus releasing the actuating mechanism subject to the mainspring, which becomes active and rings the bell by the rotation of the associated mechanism.

In the end of the arm 20 is pivotally mounted one end of a rack-arbor 30, the other end of which is mounted in the back plate, and on this rack-arbor is mounted a rod 31, carryingon its inner end an escapment 32, in engagement with wheel 23, and on the other end of the rod 31 is a tappet or clapper 33 to strike the alarm in the bell.

34: designates the bell of any of the usual dome-shape styles and is provided with acentral threaded aperture. The bell is secured in position by screwing it on the threaded end of the spindle 12, down on a collar 35, and then screwing down the fastening-nut 36, as shown. The bell serves the purpose of turning the spindle and winding up the mainspring.

The device may be secured in position to a keyhole of the lock, with the trip-arm against the face of the stile, so as to bring the lug on the trigger-spring in the path of the pins in the escape-wheel. Then the mainspring may be wound up by turning the bell and the device is ready for the purposes intended.

Having described my invention, what I claim is- 1. The combination with the bell, aspringactuated driving-gear, an escape-wheel, having oppositely-arranged stop-pins, and a tappet actuated by the escape-wheel, of a trigger-spring arranged'in the path of the pins in the escape-wheel and having an inwardlybent arm on its end'to hold the spring in such engagement.

2. The combination with the bell, a springactuated driving-gear, an escape-wheel .having oppositely-arranged stop-pins, and a tappetactuated by the escape-wheel, of a trigger-spring provided with a lug arranged to be moved into and out of the path of the said pins, and a trigger-arm slidingly mounted on the trigger-spring and formed with an inwardly-turned arm at its outer end.

3. The combination with the back plate of the ringing mechanism, of a longitudinallyarranged plate integral therewith and formed with a longitudinal slot, 9. holding-spring adapted to engage a keyhole in the lock of a door, a lever secured to one end of said spring, and a bow-spring having its ends slidably engaged in the slot, substantially as described.

4. A burglar-alarm comprising a suitable casing, a spindle journaled in the casing, a bell on the outer end of the spindle, a driving gear-wheel loosely mounted on the spindle, a mainspring having one end secured to the spindle and the other to the driving-gear, a shaft journaled in the casing, a pinion thereon in mesh with the driving-gear, an escapewheel, on the same shaft, having stop-pins therein, an escapement actuated by the escape-wheel, and provided with a tappet, a bell, and a trigger-spring formed with a lug adapted to be moved into and out of engage ment with the pins in the escape-wheel.

In testimony whereof I afiix my signature in presence of two witnesses.

REUBIN M. DUN KIN.

Witnesses:

Mrs. E. B. GRANDIN, A. W. 'EWING. 

